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  • There are no examples of doing this with a relationship field.

    You need to build custom JavaScript for ACF.

    You need to add an action that fires when the first field is changed that does an AJAX request to get values to populated the other field.

    This is easier to do using dynamically populated select fields. https://github.com/Hube2/acf-dynamic-ajax-select-example/tree/master/dynamic-select-example